replication set复制集  介绍 replicattion set 多台服务器维护相同的数据副本,提高服务器的可用性,总结下来有以下好处: 数据备份与恢复 读写分离 MongoDB 复制集的结构以及基本概念 正如上图所示,MongoDB 复制集的架构中,主要分为两部分:主节点(Primary)和从节点(Secondary). 主节点:在一个复制集中只有并且必须有一个主节点,主节点也是众多实例中唯一可以接收客户端写操作的节点,当然也可以进行读操作: 从节点:从节点会复制主节点的操作,以…

17.1.1 How to Set Up Replication 设置复制: 17.1.1.1 Setting the Replication Master Configuration 17.1.1.2 Setting the Replication Slave Configuration 17.1.1.3 Creating a User for Replication 17.1.1.4 Obtaining the Replication Master Binary Log Coordinate…

17.1 Replication Configuration 复制配置 17.1.1 How to Set Up Replication 17.1.2 Replication Formats 17.1.3 Replication with Global Transaction Identifiers 17.1.4 Replication and Binary Logging Options and Variables 17.1.5 Common Replication Administratio…

1. 高级复制和流复制介绍 1.1 高级复制(Advanced Replication) 高级复制也称为对称复制,分为多主体站点复制(Multiple Master Rplication).物化视图站点复制(Materialized View Replication)和前两种的混合复制.高级复制主要是用在对称的.等同的数据库(仅限Oracle数据库之间)表之间的(单向或双向)的复制,以满足分布式应用的需求.多主体站点复制基于Oracle的触发器(Trigger)捕获DML和DDL操作,并将这些操…

17.1.2?Replication Formats 复制格式: 17.1.2.1 Advantages and Disadvantages of Statement-Based and Row-Based Replication 17.1.2.2 Usage of Row-Based Logging and Replication 17.1.2.3 Determination of Safe and Unsafe Statements in Binary Logging 复制工作因为event…

17.2?Replication Implementation 复制实施: 17.2.1 Replication Implementation Details 17.2.2 Replication Relay and Status Logs 17.2.3 How Servers Evaluate Replication Filtering Rules 复制是基于master server跟踪所有的改变到它的数据库(updates, deletes, and so on) in its binar…

17.1 Replication Configuration 复制: 17.1.1 How to Set Up Replication 17.1.2 Replication Formats 17.1.3 Replication with Global Transaction Identifiers 17.1.4 Replication and Binary Logging Options and Variables 17.1.5 Common Replication Administration…

0. 对 list 镜像复制,a = [1, 2, 3] ⇒ [1, 2, 3, 3, 2, 1] a*2 ⇒ a = [1, 2, 3, 1, 2, 3] a.extend(reversed(a)) 1. list comprehension 顺序 二层 for 循环的顺序: [(i, j) for i in range(4) for j in range(i)] # 两个 for 循环,是从左到右进行解析的: # 也即左侧是外侧循环,越向右越表示内层循环 [(1, 0), (2, 0), (…

目标: 主机做了Mirror和Replication,当主机出现问题时,Replication和Mirror实现自动的故障转移(Mirror 和Replication都切换到备机,而当主机 重新启动后,自动充当备机的角色). 环境: 五台虚拟机,配置均为Windows2008 Enterprise + SQLServer2008R2 Enterprise 08R201:Mirror 见证机(WITNESS)           IP:192.168.56.101 08R202:主机(Rep+Mi…

目标: 主机做了Mirror和Replication,当主机出现问题时,Replication和Mirror实现自动的故障转移(Mirror 和Replication都切换到备机,而当主机 重新启动后,自动充当备机的角色). 环境: 五台虚拟机,配置均为Windows2008 Enterprise + SQLServer2008R2 Enterprise 08R201:Mirror 见证机(WITNESS)           IP:192.168.56.101 08R202:主机(Rep+Mi…